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Reports properties values
which looks like <b><font color="#000080">java.text.MessageFormat</font></b> format strings
but do not use some of the parameters of <b><font color="#000080">{xx}</font></b> kind.
<p>
  For example:
  <code><pre>
# parameter {0} is not used
<b><font color="#000080">error.message</font></b>=Something happened in line <b><font color="#000080">{1}</font></b>
</pre>
  </code>

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